Oscillating sieve



June 112, 31923.

A. JACQUEMN OSCILLATING SIEVE Filed D00. 28. 1921 6 Sheets-Sheet 1 June 32, 11923.

A. JACQUELHN OSCILLATING smvs Filed Dec. 28 1921 6Sheets-Sheet 2 msmw Emmi? E2, 1923. A. JACQUELHN oscnmwme 'sIEvE Filed D86- 28. 1921 6 Sheets-Sheet. 5

June 112, 1923'.

A. JACQUELIN OSCILLATING smvz F1163 Dec. 28 1921 6 Sheets-Sheet v June 12, 192 3;

3&58298 A. JACQUELIN oscnm'rme SIEVE Filed we. 28 1921 a Sheets-Shaa'o' 5 r i 70 f June 12, 1923. 11,458,298

A. JACQUELIN OSCILLATING SIEVE Filed Dec. 28 1921 6 sheetssheet 6 Patented June 12, 1923.

ABMAND JACQUELIN, or PARIS, FRANCE.

OSCILLATING sxnvn.

Application filed December 28, 1921. Serial No. 525,436.

T 0 all whom it may concern:

Be it known that I, ARMAND JAooUELIN, citizen of the Republic of France, residing at 11 Avenue Pasteur, Paris, France, have invented certain new and useful Improvement in Oscillating Sieves, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention has for its object an oscillating sieve, provided with a series'of special devices which are adapted to solve the problem of industrial sifting under particularly satisfactory technical and economical conditions.

The sieve forming the subject matter of this invention, comprises a casing mounted on a singlehorizontal shaft, located below the casing in front of the perforated surfaces of the riddles. The movement of the sieve from back to front is the movement of progression of the products over the riddles of the sieve. The rear portion of the riddles is inclined towards the rear of the sieve, that is, towards that portion of the sieve where the raw products are admitted to the sieve.

This particular inclination of the riddles results in the duration of the stay of the products on the rear portion of the riddles being prolonged. which is advantageous for the reason that the rear portions of the riddles support the thickest layers of the prod uct, and therefore,-must be submitted to a prolonged and accelerated shaking.

In Figure 1 of the accompanying drawings there is shown diagrammatically an example of the arrangement of the sieve. A, 13 represents the perforated surface of a riddle of the sieve of which 0 is the horizontal shaft of oscillation. The foot H of the perpendicular dropped from O on the plane A, B is outside A of the perforated surface A, B and on the front side of the riddle.

The line C, F. represents the speed with which a body C, placed on the riddle A, B. is projected by the movement of oscillation in a direction at right angles to the radius of oscillation O, C, and is of amagnit-ude proportional to this radius. l/Vhen the body is moved from B towards A, that is to say from the rear to the front of the riddle, the speed of projection of this body therefore' diminishes gradually and the same is true of the horizontal component of this speed. For these two radii, the effects of which are added together, the vertical component of the movement of projection of the grain deposited on the riddles A, B decreases very rapidly in proportion to the progression of these grains forward.

On the other hand, the dia rammatic Figure 2, in which two riddles AFB and A, B are shown, shows that two grains C and C, respectively placed towards the middle of the riddle A, B and A, B and on the same radius 0, C, C, will have speeds of projection C, F, and C, F, having the same direction, but of different magnitudes, since they are proportional to the respective distances O, H and O, H from the axis of oscillation O to the two riddles. lVe may therefore say that in the arrangement shown, the mean amplitude of the bounds with which the material progresses over any one of the riddles, is smaller the nearer the riddle considered is to the axis of oscillation, that is to say with smaller and more numerous perforations.

The invention also relates to a system for damping the oscillations of the sieve above described and to different constructional forms of this sieve.

Various arrangements according to'the invention are represented by way'of example in the accompanying drawings in which:

F1gure 3 is a general longitudinal section of the installation of the sieve.

Flgure 4 is a transverse section on the line 4L4 of Figure 3.

Figure 5 is a side view of the sieve.

Figure 6 is a plane view of the whole of the installation.

Figure 7 is a longitudinal section through a vertical plane of a sieve according to the Preceding one and also shows curved riddles.

Figure 8 is a diagram explaining the working of these curved riddles.

Figure 9 is a longitudinal section through a vertical plane of a sieve with curved riddles, certain of these latter dipping into cleaning water.

' Figure 10 is an elevation of a sieve which permits the riddles to be cleaned during the progress of the work.

The sieve comprises a parallelepipidal casing l resting on a single shaft of oscillation 2 by means of two triangular feet 8.

The walls of the casing carry perforated sheetmetal plates 4:, 5, 6, 7, 8, 9, etc, which may be flat or curved,horizontal or inclined,

superposed over each other, and the front edges 14, 15, 16, 1'7, 18, 19,- etc.', of which. are staggered relatively to each other as is shown in Figure 3, so that the waste from a grain which hasjust been broken'up in the vicinity of these edges falls onto the perforated parts of the next riddle and are shifted there. i i I The single shaft of oscillation is placed in the vertical planeof the next edge 19 of the'bottom sheet or slightly in front'of' this indicated by dotted-lines in Figure 3 and which effects a preliminary elimination of the major portion of the dust, In order to carry "out this removal of the dust, if this isnecessary, a second special grid 22 is placed at the tail of the apparatus that is to say at the end of the bottom perforated sheet which is thus shortened by the length of this grid 22. f

All the perforated metal sheets are extended towards the front by plates 24-, 25, 26, 27, 28, 29, etc, whicha're notperforated in cases where the classified" products require to bemore-or lessdiverted for the' purpose of loading thein up after sifting.

The fine products having passed through the bottom perforated metal sheet and if necessary, the special grid 22,are discharged outwards at the side through an inclined chuteBO, and in cases where the sieve is combined with a dust removing grid at the front the dust eliminated bythis grid can be returned to the chute 30by a curvedchute 31 placed at the back of the casing 1.

Finallyin order to increase the time during which the products to be drifted remain at the rear of the perforated meta-l sheets and consequently to'improve the classification angle irons 84, 35,36, 87, 38, 39, etc., staggered relatively to each other, are riveted to the perforated metal sheets in the rear portion of the casing.

In the-modification shown'in Figure 7, the sieve isprovided with riddles t, 5, 6,7, 8. 9, etc., which affect the form of an areshaped surface inclined horizontally towards the rearof the sieve the geometrical axes of which are at right angles to the plane of oscillation ofthe sieve.

The inclination of this surface relatively to the horizontal plane increases regularly from front to rear of the riddle in proportion' as the distance from this shaft of oscillation is increased.

Thisparticular form given to the riddle has the effect of causing the products lying on any one of the riddles to move forwards and upwards, and of slowing down their speed of'progression in a measure which depends both on a fixed point M, (see Figure 8) and for a given frequency ofoscillation, on the horizontal inclination of the: riddle and on the radiusof oscillation (r). The profile of'the curvature will be so chosen as to produce on these riddles instantaneous speeds of progression which are best suited to the result which it is desired to obtain. In particular the length or. time durin which the products to be sifted are stirrer up on the rear zone of the riddles may be prolonged and consequently the efliclency of the sieve andthe'quality of the sifting increased. g V

The above sieve may be combinedwith unperforatedcharging plates=20 or these plates maybe provided with the special grid 21 and'suitably inclined (see F1 gure '4).

Theqadvantagc of considerably;reducing the difference in height between the charging of the sieve andthe mean level of outa let of the sifted products is thus obtained.

lVith the sieve with curved riddles the cleaning of the sieve in stagnant water may be effected. For this purpose, it suifices to cause the rear part of the cleaning riddle or riddles 70 (see Figure 9) to dip into the water contained in a tank 71. The raw products are fed in through a hopper 72 and ascend up the inclined surface of the riddle 70. as shown by the arrow -73. sifting of the cleaned products is then car ried out in the sieve as before.

Any one-of the modifications of the sieve The according to the present invention may be combine'd'with a series of special grids such as 22placed in continuation of each metal perforated sheet at the front of the sieve.

This arrangement permits of the-double classification in" diameters and thicknesses being obtained, each category of sifting on perforated metal sheets being freed from flat products by the corresponding special grid. i

It is advantageous to carry out this double classification prior to washing because it allows of the washing together of products having practically not only the same-diameter but also those of the same thickness. I

' Any oneof the modifications of the sieve according to the "present invention can he provided with an arrangement which onables the riddles to be cleaned during the working of the sifting machine.

This arrangement consists of two openings' 87 (see Figure 1O)v made in the side walls 88 of the casing of the sieve over the whole height of the casing and affording ready access to the upper and lower faces of each riddle. The foreign bodies, such as rags, paper and fragments of wood, are removed with a small rake or a hook. Any grains which might obstruct the perforations of the riddles are advantageously dislodged by giving a slight blow under neath the riddle by the aid of a small wooden board forexample. As the operation of cleaning takes place during the working of the machine, the delivery outside the sieve of the grains thus dislodged will take place in proportion to the cleaninn operation.

The present invention also extends to a system for damping the oscillations of the sieve applicable to any of the forms of sieve hereinbefore described.

One form of construction of this system for damping is represented in Figures 1 to 6.

An oscillating movement of small amplitude but of high frequency, is communi cated to the casin'gby any suitable means for example, by a connected rod 418 (see l igure 3) driven by a crank or eccentric. The driving shaft 4-1 itself receives a uniform rotary movement either by mechanical means or by hand, or finally as is shown in Figure 3 by a special motor =13 installed on the frame of the portable sieve.

The effects of the inertia developed by the oscillating movement are damped by a damping system; This system is constituted by two groups of coiled springs, placed at the sides or at the rear of the sieve and symmetrically with respect to the plane of the longitudinal axis of this sieve. Each group comprises two series of springs '14:, 45 which are placed on either side of a fixed support L6 and are compressed alternatively during the periods of descent and ascent of the sieve. The springs 45, are opposed directly to an equal number of springs 44: and each one has its movable fulcrum on a small plate 1-? mounted with adjust-ed nuts on the end of the rod 48 securedat 4lO-to the casing and consequently oscillating with it. 'The fixed base of support common to all the springs. is constituted by a plate 4-6, fixed'to the'frame and cut away as at 49, for facilitating the mounting and dismounting of the rods 48.

Circular plates 50, rivetedto the f xed base and the movable base of each spring and having for diameter the internal diameter of the springs, hold these latter in place.

The plane of the movable base of the spring 44 passes advantageously in the im mediate vicinity of the axis of oscillation 2,

in order to reduce the lateral deformation of the springs much as possible.

The resultant of the reactions of the springs on the sieve passes advantageously in the vicinity of the centre of gyration of the sieve, so as to'reduce to a. minimum the fatigues of flexion of the oscillating casing.

The new arrangements above described ensure the following industrialresults as far as the shifting is concerned: I

A.A not-able increase in the efficiency of the delivery that is to say of the tonnage per hour of raw material sifted, regard be ing had to the weight and dimensions of space occupied by the apparatus, and a notable improvement in the quality of the calibration. i

These two taneously 2 1. By the possibility of producing an oscillating movement of high frequency by means of the use of the rational damping. arrangement, which transmits elastically to the frame of the apparatus almost the whole of the efforts of inertia which the driving members of the sieve would normally have to support, which they could only do to the great detriment of their good state of preservation.

By producing the advance of the products over the classifying riddles in the form of bonds in height, of the same frequency as that of the movement of oscillation, but of variable form and magnitude suited on the one hand to the thickness of the layer of these products and on the other hand to the mean diameter of the grains of the various categories of classification.

The advance by. successive bounds results from the existence at all points of the perforated metal sheets of a vertical com ponentin the movement of oscillation and conseqi'iently in the IIlOVQYllGIlt of projection of the grains.

T he fact that the form and the amplitude of these bonds vary from one pointto another, in a direction favourable to the qualities of classification, results from the special arrangement of the single axis of oscillation placed as is described above. In actual fact on the one hand, as has been stated above, the vertical component of the movement of projection of the grains diminished rapidly from the rear to the front of any riddle of results are attained simulthe sieve. The rear Zone of each riddle will therefore be quite specially a cleaning zone of accelerated sifting, particularly suited to the relatively thick. layers of material which are deposited there, @n the other side each riddle will in this way be fed by the preceding one from the entry to the sieve and its surface will only be better utilized. Finally the cleaning thus effected has also the effect of freeing the grains from the friable parts and the adhering dust. The angles 3%, 35, 36, 37, 38, etc., which hold back the products for a longer time in the rear Zone of the riddles, without constituting an obstacle'of a permanent kind to the advance of these products, have the effect of prolonging the period of cleaning, the

same effect being obtained with thearrangement of curved riddles (Figure 7).

On the other hand as has also been stated above the mean amplitude of the bounds bywvhich the material progresses over an riddleis the smaller the lowerthe saic riddle is placed in the series, that is to say the perforations are'smaller and consequently closer together from axis to axis. This re suit s obviously favourable to the better mensions.

mg force the number of perforated superposed metal sheets, the more so as the danger of obstruction being removed, the interval separating the successive metal sheets may be reduced with advantage.

C.The arrangements forn'nng the subject matter of the present invention permit of the expenses of upkeep and the consumptron of motive power being considerably reduced.

This result is the direct consequence of a rational damping group which the use of reduces to insignificant valuesboth the drivand the fatigue of the driving parts; i f I D.-Iort'able sifting apparatus provided with a motor of the kind shown in the accomp'anying drawing and capable of alarge output compared with its small weight and f amount of room occupied, may be con.- structed.

E.-Finally a very satisfactory removal of 'the dust obtained whatever the proportion of dust contained in the raw materials may be,by combining the, new sieve with one or more special grids.

- I claim as my invention 1. In an oscillating sieve, the combination with afixed support, of a -asing,"a single horizontal shaft carrying said casing, and arranged below the same in front of the per-- forated'surfaces of the riddles of said sieve,

the movement of the sieve from back to front being the movement of progression of the material'over the riddles, the rear portion of the riddles-being inclined towards the rear of the sieve, i. e., towards that portion where the material to be treated is admitted to thesieve, and a damping system being.

interposed between the said casing and the said fixed support.

the rear of the sieve, i. e.,towards thesaid portion where the-materialto be treated'is admited to the sieve, fixed angles ,inthe rear portion of thesieve extending overthe upper surfaces of the riddles perpeiiidicular relative to the path of progressive nniterial over the riddles, and a damping system interposed between thesaid casing and the said fixed support. q

In'an oscillating sieve, the combination with a fixed support, ofa casing, a single horizontal shaft carrying thesaid casing: and arranged belowthe same in front of the perforated surfaces of the riddles ,of' the casing, the movement of the sieve from back to fr mtbeing the movement oft-progression of the material over theriddles, the rear portion of the riddles being inclined towards the rear of the sieve, 1i. 6., towards that portion where the material to betreated is admitted to the sieve. a charging member for supplying the materialto the sieve, said member forn'iing an extensionTof the rear portion of the topmost riddle, and being also inclinedtowards the'rear ofthe sieve, and a dan'iping system interposed between the said casing and the said fixed support. 4. In an oscillating sieve, the combination with a fixed; support, of a casing, a single horizontal axis for carrying said cas-' ing and arranged below the same infront of the perforated surfacesof the riddles of the said sieve, the movement of the sieve from back to front being the movementvof progression of the material over the riddles, the rear portion of the riddles being inclined towards the rear of the sieve, i. e. towards that portion where the material tobetreated is admitted to the sieve, a charging member for supplying the material to be treatedi'to the sieve forming an extension of the rear portion of the topmost riddles, and being also inclined towards the rear of the sieve, the water'vessel adapted to receive the material to be. treated, and arranged for the said charging member to dip into the said charging member, thus simultaneously causing the i material to be treated to be cleaned and uniformly supplied to the topmost riddle of. the sieve, and a damping system interposed between the said casing and'the said fixed support, I

In an oscillating sieve, the combination with a fixed support, of a casing, a single horizontal shaft carryingthe said casing, and arranged below the same in front of the Cit perforated surfaces of the riddles, the movement of the casing from back to front being the movement of progression of the material to be treated over the riddles, the rear portion of the riddles being inclined towards the rear of the sieve, i. e., towards that portion where the material to be treated is admitted to the sieve, a charging member for supplying the material to the sieve, a dustremoving grid arranged on the said charging member, and a damping system interposed between the said casing and the said fixed support.

6. In an oscillating sieve, the combination with a fixed support, of a casing, a single horizontal shaft carrying the said casing, and arranged below the same in front of the perforated surfaces of the riddles of the said sieve, the movement of the sieve from back to front being the movement of progression over the riddles of the material to be treated. the rear portion of the riddles being inclined towards the rear of the sieve, i. e., towards that portion where the material to be treated is admitted to the sieve, dust-removing grids at the end of a certain number of riddles, and a damping system interposed between the said casing and the said fixed support.

7. In an oscillating sieve, the combination with a fixed support, of a casing, a single horizontal shaft carrying the said casing and arranged below the same in front of the perforated surfaces of the riddles of the said sieve, the movement of the sieve from back to front being the movement of progression over the riddles of the material to be treated, the rear portion of the riddles being inclined towards the rear of the sieve, i. e., towards that portion where the material to be treated is admitted to the sieve, the said casing having openings in its side walls, permitting ready access to the said riddles, and a damping system interposed between the said casing and the said fixed support.

8. In an oscillating sieve, the combination with a fixed support, of a casing, a single horizontal shaft carrying the said casing, and arranged below the same in front of the perforated surfaces of the riddles of the said casing, the movement from back to front being the movement of progression over the riddles of the material to be treated,

the rear portions of the riddles being inclined towards the rear of the sieve, i. e towards that portion where the material to be treated is admitted to the sieve, and a damping system comprising 'two sets of springs interposed between the said casing, and the said fixed support, and acting in opposite direction to each other on the said casing.

9. In an oscillating sieve, the combination with a fixed support, of a casing, a single horizontal shaft carrying the said casing, and arranged below the same in front of the perforated surfaces of the riddles of the said sieve, the movement of the sieve from back to front being the movement of progression over the riddles of the material to be treated. the rear portion of the riddles being inclined towards the rear of the sieve, i. e., towards that portion where the material to be treated is admitted to the sieve, a damping system comprising two sets of springs, bearing with their ends on either side of a fixed support directly against said casing, and the other against a transverse plate connected to the casing. v

10. In an oscillating sieve, the combination with a fixed support, of a casing, a single horizontal shaft carrying the said casing, and arranged below the same in front of the perforated surfaces of the riddles of the said casing, the movement of the sieve from back to front being the movement of progression over the riddles of the material to be treated, the rear portion of the riddles being inclined towards the rear portion of the sieve, i. e., towards that portion where the material to be treated is admitted to the sieve, a damping system comprising two sets of springs, the said springs hearing at their one ends against the said fixed support, and with the other end against the transverse plate connected with the said casing and a threaded stamp, and a nut for regulating the position of the said transverse plate relative to the said casing.

In testimony whereof I hereunto afliX my signature in the presence of two witnesses. ARMANI) JACQUELIN. Witnesses: I

LOUIS GARDET, HENRI NONIN. 

